发布时间：2014-08-25 17:55:16
http://blog.csdn.net/evenness/article/details/7955283diff是Unix系统的一个很重要的工具程序。它用来比较两个文本文件的差异，是代码版本管理的基石之一。你在命令行下，输入：1 $diff< 变动前的文件 > < 变动后的文件 .........【阅读全文】
chinaunix网友2006-06-14 20:44
我的开发板上的USB只能部分识别,高手能帮忙解决吗? 正确的打印信息如下: (前面有"!!!"的是我另外加上的打印信息,主要是在core/hub.c中的函数中) # !!! state 5 ports 4 chg 0000 evt 0010 !!! connect_change =0 !!! connect_change =0 !!! connect_change =0 !!! connect_change =0 !!! (1) hub_port_reset(hub, port1, udev, delay)=-134 !!! in hub_event, list_empty(&hub_event_list)!=0 !!! state 5 ports 2 chg 0000 evt 0004 !!! connect_change =0 !!! connect_change =0 !!! (1) hub_port_reset(hub, port1, udev, delay)=0 usb 3-2: new full speed USB device using ohci_hcd and address 2 !!! (2)hub_port_reset(hub, port1, udev, delay)=0 usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE)=18 udev->descriptor.bMaxPacketSize0=8 udev->descriptor.bLength=12 udev->descriptor.bDescriptorType=1 udev->descriptor.bcdUSB=110 udev->descriptor.bDeviceClass=0 udev->descriptor.bDeviceSubClass=0 udev->descriptor.idVendor=dd8 udev->descriptor.idProduct=1003 udev->descriptor.bcdDevice=200 udev->descriptor.iManufacturer=1 udev->descriptor.iProduct=2 udev->descriptor.iSerialNumber=0 udev->descriptor.bNumConfigurations=1 !!! new device strings: Mfr=1, Product=2, SerialNumber=0 !!! begin to usb_device_match() !!! begin to usb_device_match() !!! begin to usb_device_match() !!! begin to usb_device_match() !!! begin to usb_probe_interface scsi2 : SCSI emulation for USB Mass Storage devices !!! hub_port_connect_change return !!! state 5 ports 2 chg 0000 evt 0004 !!! connect_change =0 !!! connect_change =0 !!! in hub_event, list_empty(&hub_event_list)!=0 !!! in hub_thread() ,after hub_event,begin wait_event_interruptible ! Vendor: Model: Rev: Type: Direct-Access ANSI SCSI revision: 02 SCSI device sda: 62048 512-byte hdwr sectors (32 MB) sda: assuming drive cache: write through SCSI device sda: 62048 512-byte hdwr sectors (32 MB) sda: assuming drive cache: write through sda: sda1 Attached scsi disk sda at scsi2, channel 0, id 0, lun 0 Attached scsi generic sg0 at scsi2, channel 0, id 0, lun 0, type 0 不能识别的USB 的打印信息如下: # !!! state 5 ports 4 chg 0000 evt 0010 !!! connect_change =0 !!! connect_change =0 !!! connect_change =0 !!! connect_change =0 !!! (1) hub_port_reset(hub, port1, udev, delay)=-134 !!! in hub_event, list_empty(&hub_event_list)!=0 !!! state 5 ports 2 chg 0000 evt 0004 !!! connect_change =0 !!! connect_change =0 !!! (1) hub_port_reset(hub, port1, udev, delay)=0 usb 3-2: new full speed USB device using ohci_hcd and address 3 !!! (2)hub_port_reset(hub, port1, udev, delay)=0 usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE)=18 udev->descriptor.bMaxPacketSize0=64 udev->descriptor.bLength=12 udev->descriptor.bDescriptorType=1 udev->descriptor.bcdUSB=110 udev->descriptor.bDeviceClass=0 udev->descriptor.bDeviceSubClass=0 udev->descriptor.idVendor=204 udev->descriptor.idProduct=6025 udev->descriptor.bcdDevice=100 udev->descriptor.iManufacturer=0 udev->descriptor.iProduct=0 udev->descriptor.iSerialNumber=0 udev->descriptor.bNumConfigurations=1 !!! new device strings: Mfr=0, Product=0, SerialNumber=0 !!! begin to usb_device_match() !!! begin to usb_device_match() !!! begin to usb_device_match() !!! begin to usb_device_match() !!! begin to usb_probe_interface scsi3 : SCSI emulation for USB Mass Storage devices !!! hub_port_connect_change return !!! state 5 ports 2 chg 0000 evt 0004 !!! connect_change =0 !!! connect_change =0 !!! in hub_event, list_empty(&hub_event_list)!=0 !!! in hub_thread() ,after hub_event,begin wait_event_interruptible ! /******************这里要等待一段时间************************/ !!! (1) hub_port_reset(hub, port1, udev, delay)=0 usb 3-2: reset full speed USB device using ohci_hcd and address 3 usb 3-2: scsi_eh_3 timed out on ep0in !!! (2)hub_port_reset(hub, port1, udev, delay)=0 usb 3-2: device descriptor read/64, error -145 usb 3-2: scsi_eh_3 timed out on ep0in !!! (2)hub_port_reset(hub, port1, udev, delay)=0 usb 3-2: device descriptor read/64, error -145 !!! state 5 ports 2 chg 0000 evt 0004 !!! connect_change =0 !!! connect_change =0 !!! in hub_event, list_empty(&hub_event_list)!=0 .........................以下省略 初看好象前面都是一样的,直到执行函数wait_event_interruptible(khubd_wait, !list_empty(&hub_event_list))的时候,出现问题,但我不知道为什么会出现这样的问题.有高手知道吗?? 下面是/usb/core/hub.c中的线程函数: static int hub_thread(void *__unused) { /* * This thread doesn't need any user-level access, * so get rid of all our resources */ daemonize("khubd"); allow_signal(SIGKILL); /* Send me a signal to get me die (for debugging) */ do { hub_events(); wait_event_interruptible(khubd_wait, !list_empty(&hub_event_list)); try_to_freeze(PF_FREEZE); } while (!signal_pending(current)); pr_debug ("%s: khubd exiting\n", usbcore_name); complete_and_exit(&khubd_exited, 0); } 我都快分析了一周了,没解决! 求高手,帮忙分析一下!
